East Antarctic Climate and Environmental Variability over the Last 9400 Years Inferred from Marine Sediments of the Bunger Oasis
East Antarctic Climate and Environmental Variability over the Last 9400 Years Inferred from Marine Sediments of the Bunger Oasis
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DOI：
10.1080/15230430.2001.12003425
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发表时间：
2001-05
期刊：
影响因子：
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通讯作者：
T. Kulbe;M. Melles;Sergej R. Verkulich;Z. Pushina
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文献类型：
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作者：
T. Kulbe;M. Melles;Sergej R. Verkulich;Z. Pushina
南极洲周围的沉积物岩心提供了一个独特的机会来交叉核对和补充冰芯中记录的气候信息。然而，到目前为止，还没有从东南极洲获得合适的高分辨率数据。我们介绍了迄今为止在南极东部盆地获得的最长的连续冰期后海洋沉积演替（1290厘米）的结果。在过去的9400校准年BP （cal. yr BP）中，21个放射性碳年代显示了一致的年龄与深度相关性。在这段时间内，与硅化冰相关的生物物种组合、有机碳积累速率、δ13C值和C/N比值发生了明显变化。我们证明这些沉积物特征可以用作气候指标。研究结果表明，全新世气候变化显著，气候最优期在3500 ~ 2500 cal. yr BP之间。随后，在不到200年的时间里，发生了一次突然而剧烈的降温。为了证实其他研究人员的结果，我们假设，这一气候最佳期及其终止是一次环北极事件，似乎与全新世提出的全球温度趋势（最大值）不一致。
Sediment cores around Antarctica provide a unique opportunity to cross check and supplement the climatic information recorded in ice cores. Suitable high-resolution data, however, have not been available until now from East Antarctica. We present results from the longest continuous postglacial marine sediment succession (1290 cm) ever obtained from an East Antarctic basin. Twenty-one radiocarbon dates show a consistent age to depth correlation over the last 9400 calibrated years BP (cal. yr BP). For this time interval distinct changes in the silicified ice-related biotic species assemblages, accumulation rates of organic carbon, δ13C values, and C/N ratios were detected. We demonstrate that these sediment signatures can be used as climate proxies. Our results indicate significant Holocene climatic variability with a climatic optimum between 3500 and 2500 cal. yr BP. This was followed by an abrupt and dramatic cooling that took place within less than 200 yr. Corroborating the results of other researchers we hypothesize that this climatic optimum and its termination was a circumantarctic event which would appear to be out of phase with a proposed global temperature trend (maximum) during the Holocene.